- Therapeutic anticoagulation with warfarin, antiplatelet agents (e.g., clopidogrel), thrombin, or Factor Xa inhibitors is not allowed; therapeutic anticoagulation with low molecular weight heparin (LMWH) is allowed as well as prophylactic anticoagulation using low dose aspirin (=< 81 mg/day), low-dose warfarin (=< 1 mg/day), and LMWH